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Corrections for I-AB is invertible if and only if I-BA is invertible
1. general proof by asteroid on 2007-09-08 13:45:30 (accepted)
2. Contains proof by rspuzio on 2004-10-21 01:13:54 (accepted)
3. A stronger result by CWoo on 2004-10-17 19:15:53 (accepted) (1)
4. Infinite dimensional case by rspuzio on 2004-10-17 15:19:46 (accepted)

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